Mojo: Make some attempts towards fixing remote message pipe closure.

mojo/system/message_in_transit.cc

Index: mojo/system/message_in_transit.cc
diff --git a/mojo/system/message_in_transit.cc b/mojo/system/message_in_transit.cc
index 73cefe38dda703bda5dc23be400904719104dbd2..442cd7142df5a827e1595c1b2d04a43c0bf13fd0 100644
--- a/mojo/system/message_in_transit.cc
+++ b/mojo/system/message_in_transit.cc
@@ -49,7 +49,11 @@ STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Type
 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype
     MessageInTransit::kSubtypeMessagePipeEndpointData;
 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype
-    MessageInTransit::kSubtypeMessagePipePeerClosed;
+    MessageInTransit::kSubtypeChannelRunMessagePipeEndpoint;
+STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype
+    MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpoint;
+STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype
+    MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpointAck;
 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::EndpointId
     MessageInTransit::kInvalidEndpointId;
 STATIC_CONST_MEMBER_DEFINITION const size_t MessageInTransit::kMessageAlignment;